mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 23:38:09 +00:00
145 lines
4.2 KiB
Python
145 lines
4.2 KiB
Python
'''USB HID implementation of Transport.'''
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import hid
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import time
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from .transport import TransportV1, TransportV2, ConnectionError
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def enumerate():
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"""
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Return a list of available TREZOR devices.
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"""
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devices = {}
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for d in hid.enumerate(0, 0):
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vendor_id = d['vendor_id']
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product_id = d['product_id']
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serial_number = d['serial_number']
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interface_number = d['interface_number']
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usage_page = d['usage_page']
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path = d['path']
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if (vendor_id, product_id) in DEVICE_IDS:
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devices.setdefault(serial_number, [None, None])
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# first match by usage_page, then try interface number
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if usage_page == 0xFF00 or interface_number == 0: # normal link
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devices[serial_number][0] = path
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elif usage_page == 0xFF01 or interface_number == 1: # debug link
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devices[serial_number][1] = path
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# List of two-tuples (path_normal, path_debuglink)
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return sorted(devices.values())
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def path_to_transport(path):
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try:
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device = [ d for d in hid.enumerate(0, 0) if d['path'] == path ][0]
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except IndexError:
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raise ConnectionError("Connection failed")
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# VID/PID found, let's find proper transport
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try:
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transport = DEVICE_TRANSPORTS[(device['vendor_id'], device['product_id'])]
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except IndexError:
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raise Exception("Unknown transport for VID:PID %04x:%04x" % (vid, pid))
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return transport
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class _HidTransport(object):
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def __init__(self, device, *args, **kwargs):
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self.hid = None
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self.hid_version = None
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device = device[int(bool(kwargs.get('debug_link')))]
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super(_HidTransport, self).__init__(device, *args, **kwargs)
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def is_connected(self):
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"""
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Check if the device is still connected.
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"""
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for d in hid.enumerate(0, 0):
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if d['path'] == self.device:
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return True
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return False
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def _open(self):
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self.hid = hid.device()
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self.hid.open_path(self.device)
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self.hid.set_nonblocking(True)
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# determine hid_version
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if isinstance(self, HidTransportV2):
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self.hid_version = 2
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else:
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r = self.hid.write([0, 63, ] + [0xFF] * 63)
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if r == 65:
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self.hid_version = 2
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return
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r = self.hid.write([63, ] + [0xFF] * 63)
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if r == 64:
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self.hid_version = 1
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return
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raise ConnectionError("Unknown HID version")
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def _close(self):
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self.hid.close()
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self.hid = None
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def _write_chunk(self, chunk):
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if len(chunk) != 64:
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raise Exception("Unexpected data length")
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if self.hid_version == 2:
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self.hid.write(b'\0' + chunk)
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else:
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self.hid.write(chunk)
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def _read_chunk(self):
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start = time.time()
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while True:
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data = self.hid.read(64)
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if not len(data):
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if time.time() - start > 10:
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# Over 10 s of no response, let's check if
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# device is still alive
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if not self.is_connected():
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raise ConnectionError("Connection failed")
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# Restart timer
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start = time.time()
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time.sleep(0.001)
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continue
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break
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if len(data) != 64:
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raise Exception("Unexpected chunk size: %d" % len(data))
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return bytearray(data)
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class HidTransportV1(_HidTransport, TransportV1):
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pass
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class HidTransportV2(_HidTransport, TransportV2):
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pass
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DEVICE_IDS = [
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(0x534c, 0x0001), # TREZOR
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(0x1209, 0x53C0), # TREZORv2 Bootloader
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(0x1209, 0x53C1), # TREZORv2
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]
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DEVICE_TRANSPORTS = {
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(0x534c, 0x0001): HidTransportV1, # TREZOR
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(0x1209, 0x53C0): HidTransportV2, # TREZORv2 Bootloader
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(0x1209, 0x53C1): HidTransportV2, # TREZORv2
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}
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# Backward compatible wrapper, decides for proper transport
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# based on VID/PID of given path
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def HidTransport(device, *args, **kwargs):
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transport = path_to_transport(device[0])
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return transport(device, *args, **kwargs)
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# Backward compatibility hack; HidTransport is a function, not a class like before
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HidTransport.enumerate = enumerate
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